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aschiano: omega 2
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aschiano: aligned by hand colorcalib deconv
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aschiano: Hubble image of the Ring Nebula (Messier 57)
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aschiano: best m57
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aschiano: second best m57
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aschiano: HDR best M57
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aschiano: better abell 2151
©
aschiano: better abell 2151 invert BW